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// revisions: current next
//[next] compile-flags: -Znext-solver
struct Test {
func: Box<dyn FnMut() + 'static>,
}
fn main() {
let closure: Box<dyn Fn() + 'static> = Box::new(|| ());
let test = Box::new(Test { func: closure }); //~ ERROR trait upcasting coercion is experimental [E0658]
}
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